diff --git a/config/pac.m4 b/config/pac.m4
index ec20cd12..095a5a8f 100644
--- a/config/pac.m4
+++ b/config/pac.m4
@@ -635,7 +635,7 @@ if test "x$pac_slu_header_ok" == "xyes" ; then
     LIBS="$SLU_LIBS -lm $save_LIBS";
     AC_TRY_LINK_FUNC(superlu_malloc, 
 		     [mld2p4_cv_have_superlu=yes;pac_slu_lib_ok=yes;],
-		     [mld2p4_cv_have_superlu=no;pac_slu_lib_ok=no; SLU_LIBS=""; SLU_INCLUDES=""])
+		     [mld2p4_cv_have_superlu=no;pac_slu_lib_ok=no; SLU_LIBS=""; ])
  fi
  if test "x$pac_slu_lib_ok" == "xno" ; then 
     dnl Maybe lib64?
@@ -643,7 +643,7 @@ if test "x$pac_slu_header_ok" == "xyes" ; then
     LIBS="$SLU_LIBS -lm $save_LIBS";
     AC_TRY_LINK_FUNC(superlu_malloc, 
 		     [mld2p4_cv_have_superlu=yes;pac_slu_lib_ok=yes;],
-		     [mld2p4_cv_have_superlu=no;pac_slu_lib_ok=no; SLU_LIBS=""; SLU_INCLUDES=""])
+		     [mld2p4_cv_have_superlu=no;pac_slu_lib_ok=no; SLU_LIBS=""; ])
  fi
  AC_MSG_RESULT($pac_slu_lib_ok)
 fi
diff --git a/configure b/configure
index 0b9df7ce..78f8eacd 100755
--- a/configure
+++ b/configure
@@ -11798,7 +11798,7 @@ else
   $as_echo "$as_me: failed program was:" >&5
 sed 's/^/| /' conftest.$ac_ext >&5
 
-	mld2p4_cv_have_superlu=no;pac_slu_lib_ok=no; SLU_LIBS=""; SLU_INCLUDES=""
+	mld2p4_cv_have_superlu=no;pac_slu_lib_ok=no; SLU_LIBS="";
 fi
 
 rm -rf conftest.dSYM
@@ -11856,7 +11856,7 @@ else
   $as_echo "$as_me: failed program was:" >&5
 sed 's/^/| /' conftest.$ac_ext >&5
 
-	mld2p4_cv_have_superlu=no;pac_slu_lib_ok=no; SLU_LIBS=""; SLU_INCLUDES=""
+	mld2p4_cv_have_superlu=no;pac_slu_lib_ok=no; SLU_LIBS="";
 fi
 
 rm -rf conftest.dSYM